django.db.models TextField Python Example Code

TextField is a field used to create an arbitrary amount of text characters in a database column defined by the Django ORM.

The Django project has wonderful documentation for TextField and all of the other column fields.

Note that TextField is defined within the django.db.models.fields module but is typically referenced from django.db.models rather than including the fields module reference.

Example 1 from django-smithy

django-smithy is a code library for Django that makes it easy for users to send HTTP requests from the Django admin user interface. The code for the project is open source under the MIT license.

django-smithy / smithy / models.py

# -*- coding: utf-8 -*-

from django.db import models
from django.db.models.signals import post_save
from django.dispatch import receiver
from requests import Request as HTTPRequest, Session
from requests.cookies import create_cookie, RequestsCookieJar
from urllib.parse import parse_qs, urlparse, urlencode
from requests_toolbelt.utils import dump

from model_utils.models import TimeStampedModel

from smithy.helpers import render_with_context, parse_dump_result


class NameValueModel(TimeStampedModel):
    name = models.CharField(max_length = 200)
    value = models.TextField(blank = True)

    def __str__(self):
        return self.name

    class Meta:
        abstract = True


class Request(TimeStampedModel):
    """
    A base model shared by RequestBlueprint and
    RequestRecord. Used solely to reduce
    """
    METHODS = (
        ('GET', 'GET'),
        ('POST', 'POST'),
        ('PUT', 'PUT'),
        ('DELETE', 'DELETE'),
        ('OPTIONS', 'OPTIONS'),
        ('HEAD', 'HEAD'),
    )
    BODY_TYPES = (
        ('', 'Other'),
        ('application/x-www-form-urlencoded', 'x-www-form-urlencoded'),
        ('application/json', 'JSON'),
        ('text/plain', 'Text'),
        ('application/javascript', 'JavaScript'),
        ('application/xml', 'XML (application/xml)'),
        ('text/xml', 'XML (text/xml)'),
        ('text/html', 'HTML'),
    )
    method = models.CharField(
        max_length = 7, choices = METHODS,
        blank = False, null = False)
    name = models.CharField(max_length = 500, blank = False)
    url = models.CharField(max_length = 2083)
    body = models.TextField(blank = True)
    content_type = models.CharField(
        default = BODY_TYPES[0][0],
        blank = True, null = True,
        max_length = 100, choices = BODY_TYPES)

    def __str__(self):
        if self.name:
            return self.name
        return "{} {}".format(
            self.method,
            self.url,
        )


class RequestBlueprint(Request):
    """
    A blueprint for HTTP requests. This model will be
    used to generate and send HTTP requests. Once sent,
    a RequestRecord will be created for that request.
    """
    follow_redirects = models.BooleanField(
        default = False, blank = False, null = False)

    @property
    def name_value_related(self):
        return [
            self.headers,
            self.query_parameters,
            self.cookies
        ]

    def send(self, context = None):

        context = context or {}
        for variable in self.variables.all():
            context[variable.name] = variable.value

        request = HTTPRequest(
            url = render_with_context(self.url, context),
            method = self.method)

        session = Session()
        record = RequestRecord.objects.create(blueprint = self)

        # Copy RequestBlueprint values to RequestRecord
        for qs in self.name_value_related:
            for obj in qs.all():
                obj.pk = 0
                obj.name = render_with_context(obj.name, context)
                obj.value = render_with_context(obj.value, context)
                obj.add_to(request)
                obj.request = record
                obj.save()

        if self.content_type == self.BODY_TYPES[0][0]:
            data = render_with_context(self.body, context)
        else:
            data = {}
            for param in self.body_parameters.all():
                param.add_to(data, context)

        request.data = data
        prepared_request = request.prepare()

        response = session.send(prepared_request, stream = True)
        # TODO: follow redirects

        RequestRecord.objects.filter(pk = record.pk).update(
            raw_request = parse_dump_result(dump._dump_request_data, prepared_request),
            raw_response = parse_dump_result(dump._dump_response_data, response),
            status = response.status_code,
            **RequestRecord.get_clone_args(self, context)
        )

        # Return fresh copy after update
        return RequestRecord.objects.get(pk = record.pk)


class RequestRecord(Request):
    """
    A record of a Request that has been sent.
    Contains response and diagnostic information
    about the request.
    """
    raw_request = models.TextField()
    raw_response = models.TextField()
    status = models.PositiveIntegerField(null = True)
    blueprint = models.ForeignKey(
        'smithy.RequestBlueprint',
        on_delete = models.SET_NULL,
        null = True)

    @property
    def is_success(self):
        return self.status and self.status < 400

    @staticmethod
    def of_blueprint(blueprint):
        return RequestRecord.objects.filter(
            blueprint = blueprint)

    @classmethod
    def get_clone_args(cls, obj, context : dict):
        return dict([
            (
                render_with_context(fld.name, context),
                render_with_context(getattr(obj, fld.name), context)
            )
            for fld \
            in cls._meta.fields \
            if fld.name != obj._meta.pk \
            and fld in obj._meta.fields \
            and fld.name not in [
                   'request', 'id', 'created', 'updated'
               ]])


## source file continues from here without further TextField examples

Example 2 from django-push-notifications

django-push-notifications is a Django app for storing and interacting with push notification services such as Google's Firebase Cloud Messaging and Apple Notifications. The django-push-notification project's source code is available open source under the MIT license.

django-push-notifications / push_notifications / migrations / 0001_initial.py

# -*- coding: utf-8 -*-
from __future__ import unicode_literals

from django.conf import settings
from django.db import migrations, models

import push_notifications.fields


class Migration(migrations.Migration):

    dependencies = [
        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
    ]

    operations = [
        migrations.CreateModel(
            name='APNSDevice',
            fields=[
                ('id', 
                 models.AutoField(verbose_name='ID', 
                                  serialize=False, 
                                  auto_created=True, 
                                  primary_key=True)),
                ('name', 
                 models.CharField(max_length=255, 
                                  null=True, 
                                  verbose_name='Name', 
                                  blank=True)),
                ('active', 
                 models.BooleanField(default=True, 
                                     help_text='Inactive devices '
                                               'will not be sent '
                                               'notifications', 
                                     verbose_name='Is active')),
                ('date_created', 
                 models.DateTimeField(auto_now_add=True, 
                                      verbose_name='Creation date', 
                                      null=True)),
                ('device_id', 
                 models.UUIDField(help_text='UDID / '
                                            'UIDevice.'
                                            'identifierForVendor()', 
                                  max_length=32, 
                                  null=True, 
                                  verbose_name='Device ID', 
                                  blank=True, 
                                  db_index=True)),
                ('registration_id', 
                 models.CharField(unique=True, max_length=64, 
                                  verbose_name='Registration ID')),
                ('user', 
                 models.ForeignKey(blank=True, 
                                   to=settings.AUTH_USER_MODEL, 
                                   null=True, 
                                   on_delete=models.CASCADE)),
            ],
            options={
                'verbose_name': 'APNS device',
            },
            bases=(models.Model,),
        ),
        migrations.CreateModel(
            name='GCMDevice',
            fields=[
                ('id', 
                 models.AutoField(verbose_name='ID', 
                                  serialize=False, 
                                  auto_created=True, 
                                  primary_key=True)),
                ('name', 
                 models.CharField(max_length=255, 
                                  null=True, 
                                  verbose_name='Name', 
                                  blank=True)),
                ('active', 
                 models.BooleanField(default=True, 
                                     help_text='Inactive devices '
                                               'will not be sent '
                                               'notifications', 
                                     verbose_name='Is active')),
                ('date_created', 
                 models.DateTimeField(auto_now_add=True, 
                                      verbose_name='Creation date', 
                                      null=True)),
                ('device_id', 
                 push_notifications.fields.HexIntegerField(\
                   help_text='ANDROID_ID / TelephonyManager.'
                             'getDeviceId() (always as hex)', 
                   null=True, verbose_name='Device ID', 
                   blank=True, db_index=True)),
                ('registration_id', 
                 models.TextField(verbose_name='Registration ID')),
                ('user', 
                 models.ForeignKey(blank=True, 
                                   to=settings.AUTH_USER_MODEL, 
                                   null=True, 
                                   on_delete=models.CASCADE)),
            ],
            options={
                'verbose_name': 'GCM device',
            },
            bases=(models.Model,),
        ),
    ]

Example 3 from AuditLog

Auditlog (project documentation) is a Django app that logs changes to Python objects, similar to the Django admin's logs but with more details and output formats. Auditlog's source code is provided as open source under the MIT license.

AuditLog / src / auditlog_tests / models.py

import uuid

from django.contrib.postgres.fields import ArrayField
from django.db import models
from auditlog.models import AuditlogHistoryField
from auditlog.registry import auditlog

from multiselectfield import MultiSelectField


@auditlog.register()
class SimpleModel(models.Model):
    """
    A simple model with no special things going on.
    """

    text = models.TextField(blank=True)
    boolean = models.BooleanField(default=False)
    integer = models.IntegerField(blank=True, null=True)
    datetime = models.DateTimeField(auto_now=True)

    history = AuditlogHistoryField()


class AltPrimaryKeyModel(models.Model):
    """
    A model with a non-standard primary key.
    """

    key = models.CharField(max_length=100, primary_key=True)

    text = models.TextField(blank=True)
    boolean = models.BooleanField(default=False)
    integer = models.IntegerField(blank=True, null=True)
    datetime = models.DateTimeField(auto_now=True)

    history = AuditlogHistoryField(pk_indexable=False)


class UUIDPrimaryKeyModel(models.Model):
    """
    A model with a UUID primary key.
    """

    id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)

    text = models.TextField(blank=True)
    boolean = models.BooleanField(default=False)
    integer = models.IntegerField(blank=True, null=True)
    datetime = models.DateTimeField(auto_now=True)

    history = AuditlogHistoryField(pk_indexable=False)


class ProxyModel(SimpleModel):
    """
    A model that is a proxy for another model.
    """

    class Meta:
        proxy = True


class RelatedModel(models.Model):
    """
    A model with a foreign key.
    """

    related = models.ForeignKey(to='self', on_delete=models.CASCADE)

    history = AuditlogHistoryField()


class ManyRelatedModel(models.Model):
    """
    A model with a many to many relation.
    """

    related = models.ManyToManyField('self')

    history = AuditlogHistoryField()


@auditlog.register(include_fields=['label'])
class SimpleIncludeModel(models.Model):
    """
    A simple model used for register's include_fields kwarg
    """

    label = models.CharField(max_length=100)
    text = models.TextField(blank=True)

    history = AuditlogHistoryField()


class SimpleExcludeModel(models.Model):
    """
    A simple model used for register's exclude_fields kwarg
    """

    label = models.CharField(max_length=100)
    text = models.TextField(blank=True)

    history = AuditlogHistoryField()


class SimpleMappingModel(models.Model):
    """
    A simple model used for register's mapping_fields kwarg
    """

    sku = models.CharField(max_length=100)
    vtxt = models.CharField(verbose_name='Version', max_length=100)
    not_mapped = models.CharField(max_length=100)

    history = AuditlogHistoryField()


class AdditionalDataIncludedModel(models.Model):
    """
    A model where get_additional_data is defined which allows for logging extra
    information about the model in JSON
    """

    label = models.CharField(max_length=100)
    text = models.TextField(blank=True)
    related = models.ForeignKey(to=SimpleModel, on_delete=models.CASCADE)

    history = AuditlogHistoryField()

    def get_additional_data(self):
        """
        Returns JSON that captures a snapshot of additional details of the
        model instance. This method, if defined, is accessed by auditlog
        manager and added to each logentry instance on creation.
        """
        object_details = {
            'related_model_id': self.related.id,
            'related_model_text': self.related.text
        }
        return object_details


class DateTimeFieldModel(models.Model):
    """
    A model with a DateTimeField, used to test DateTimeField
    changes are detected properly.
    """
    label = models.CharField(max_length=100)
    timestamp = models.DateTimeField()
    date = models.DateField()
    time = models.TimeField()
    naive_dt = models.DateTimeField(null=True, blank=True)

    history = AuditlogHistoryField()


class ChoicesFieldModel(models.Model):
    """
    A model with a CharField restricted to a set of choices.
    This model is used to test the changes_display_dict method.
    """
    RED = 'r'
    YELLOW = 'y'
    GREEN = 'g'

    STATUS_CHOICES = (
        (RED, 'Red'),
        (YELLOW, 'Yellow'),
        (GREEN, 'Green'),
    )

    status = models.CharField(max_length=1, choices=STATUS_CHOICES)
    multiselect = MultiSelectField(max_length=3, choices=STATUS_CHOICES, max_choices=3)
    multiplechoice = models.CharField(max_length=3, choices=STATUS_CHOICES)

    history = AuditlogHistoryField()


class CharfieldTextfieldModel(models.Model):
    """
    A model with a max length CharField and a Textfield.
    This model is used to test the changes_display_dict
    method's ability to truncate long text.
    """

    longchar = models.CharField(max_length=255)
    longtextfield = models.TextField()

    history = AuditlogHistoryField()


class PostgresArrayFieldModel(models.Model):
    """
    Test auditlog with Postgres's ArrayField
    """
    RED = 'r'
    YELLOW = 'y'
    GREEN = 'g'

    STATUS_CHOICES = (
        (RED, 'Red'),
        (YELLOW, 'Yellow'),
        (GREEN, 'Green'),
    )

    arrayfield = ArrayField(models.CharField(max_length=1, choices=STATUS_CHOICES), size=3)

    history = AuditlogHistoryField()


class NoDeleteHistoryModel(models.Model):
    integer = models.IntegerField(blank=True, null=True)

    history = AuditlogHistoryField(delete_related=False)


auditlog.register(AltPrimaryKeyModel)
auditlog.register(UUIDPrimaryKeyModel)
auditlog.register(ProxyModel)
auditlog.register(RelatedModel)
auditlog.register(ManyRelatedModel)
auditlog.register(ManyRelatedModel.related.through)
auditlog.register(SimpleExcludeModel, exclude_fields=['text'])
auditlog.register(SimpleMappingModel, mapping_fields={'sku': 'Product No.'})
auditlog.register(AdditionalDataIncludedModel)
auditlog.register(DateTimeFieldModel)
auditlog.register(ChoicesFieldModel)
auditlog.register(CharfieldTextfieldModel)
auditlog.register(PostgresArrayFieldModel)
auditlog.register(NoDeleteHistoryModel)

Example 4 from django-sql-explorer

django-sql-explorer (PyPI page), also referred to as "SQL Explorer", is a code library for the Django Admin that allows approved, authenticated users to view and execute direct database SQL queries. The tool keeps track of executed queries so users can share them with each other, as well as export results to downloadable formats. django-sql-explorer is provided as open source under the MIT license.

django-sql-explorer / explorer / migrations / 0002_auto_20150501_1515.py

# -*- coding: utf-8 -*-
from __future__ import unicode_literals

from django.db import models, migrations


class Migration(migrations.Migration):

    dependencies = [
        ('explorer', '0001_initial'),
    ]

    operations = [
        migrations.RemoveField(
            model_name='querylog',
            name='is_playground',
        ),
        migrations.AlterField(
            model_name='querylog',
            name='sql',
            field=models.TextField(null=True, blank=True),
        ),
    ]
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